By default, Firefox 3 prevents users from installing any extensions that do not offer a secure connection for automatic updates. This prevents users from being victims of hijacked update URLs.
But for developers or people installing extensions they know they can trust, it is a pain.
Luckily it is easily disabled by:
Ran into this problem when installing Extension Developer’s Extension while working on Read It Later.
Found the solution at MozillaZine (via Google)
Tags: about:config, browser, extension, firefox, google, mozilla, Open Source, theme, web plugin
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